Please answer fast Question 2An ion channel in a cell membrane is modeled as a cylindrical opening in the membrane. Because theion concentration outside the cell is larger than that inside the cell, there is a net flux of ions fromoutside to inside. If the diameter of the cylindrical opening is doubled, the number of ions per timepassing into the cell is:O unchangedO halvedquadrupleddoubledO quarteredQuestion 4Initially at rest, a gazelle accelerates at a constant rate, moving in a straight line. After 10 seconds itachieves a speed of 25 m/s. How far did the gazelle travel?250 mO 125 m62.5 mO 500 mnot enough information to determine Question 5You are observing a microbead (with mass 10 µg) undergoing random motion in a glycerin solution.The microbead has an initial velocity of 10 um/s (micrometers per second) along the x-axis.Suddenly its velocity changes to -5 µm/s, still along the x-axis. What was the impulse experiencedby the microbead in units of µg-um/s?O -100O +150+100-150-50

Answered: Image /qna-images/answer/e8898c01-3e60-44c0-bcb1-7ddfd3773351.jpg

An ion channel in a cell membrane is modeled as a cylindrical opening in the membrane. Because the ion concentration outside the cell is larger than that inside the cell, there is a net flux of ions from outside to inside. If the diameter of the cylindrical opening is doubled, the number of ions per time passing into the cell is: unchanged halved quadrupled doubled quartered

An ion channel in a cell membrane is modeled as a cylindrical opening in the membrane. Because the ion concentration outside the cell is larger than that inside the cell, there is a net flux of ions from outside to inside. If the diameter of the cylindrical opening is doubled, the number of ions per time passing into the cell is: unchanged halved quadrupled doubled quartered

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Introduction

Section: Chapter Questions

Problem 54AP

See similar textbooks

Similar questions

The nucleus of an atom can be modeled as several protons and neutrons closely packed together. Each particle has a mass of 1.67 x 10-27 kg and radius on the order of 10-15 m. (a) Use this model and the data provided to estimate the density of the nucleus of an atom. | kg/m³ (b) Compare your result with the density of a material such as iron w = 7874 kg/m?). What do your result and comparison suggest about the structure of matter?
ents 41 An airplane has a mass of 1.4x10 kg, and the air flows past the lower surface of the wings at 93 m/s Part A If the wings have a surface area of 1400 m², how fast must the air flow over the upper surface of the wing if the plane is to stay in the air? Express your answer to two significant figures and include the appropriate units. HÅ Submit Value Request Answer stv Units Review Constants 2
A relationship is found between the number density of cars on a freeway during rush hour, N, and distance. The relationship can be written as k a'N No dr? From this you can conclude that O w = V No O v = No No O v =
Oxygen reaches the veinless cornea of the eye by diffusing through its tear layer, which is 0.500-mm thick. How long does it take the average oxygen molecule to do this?
(a) Suppose that a person has an average heart rate of 72.0 beats/mm. How many beats does he or she have in 2.0 years? (b) In 2.00 years? (c) In 2.000 years?
Under the conditions of normal activity, an adult inhales about 1 L of air during each inhalation. With the aid of a watch, determine the time for one of your own inhalations by timing several breaths and dividing the total length by the number of breaths. calculate the average air speedin meters per second through your trachea during eachinhalation. The radius of the trachea in adult humans isapproximately 10−2 m . From the data above, calculate theReynolds number for the air flow in the trachea duringinhalation. Do you expect the air flow to be laminar or turbulent?
The continuity equation satisfied by u = 4xy+y?, v= 6xy+ 3y 10 u= 3x^2-2y^2, v=-6xy .II O u=x-4y, v=y-4x .IIIO
58. A retired partner from a large brokerage firm hasone million dollars available to invest in particularstocks or bonds. Each investment’s annual rate ofreturn depends on the state of the economy in thecoming year. The file P09_58.xlsx contains thedistribution of returns for these stocks and bonds asa function of the economy’s state in the coming year.As this file indicates, the returns from stocks andbonds in a fair economy are listed as X and Y. Thisinvestor wants to allocate her one million dollars tomaximize her expected value of the portfolio oneyear from now.a. If X 5 Y 5 15%, find the optimal investment strategy for this investor. (Hint: You could try a decisiontree approach, but it would involve a massive tree.It is much easier to find an algebraic expression forthe expected final value of the investment whena percentage p is put in stocks and the remainingpercentage is put in bonds.)b. For which values of X (where 10% , X , 20%)and Y (where 12.5% , Y , 17.5%), if any,…
The continuity equation satisfied by u=x-4y,v=y-4x .1O U = 4xy+ y2, v= 6xy+ 3y .IIO u= 3x^2-2y^2, v=-6xy.III O
Pd Pd 1. Let's consider a toy model of nuclear fission. Suppose an nucleus of Uranium-235 (92 protons, molar weight of 235 g/mole) "splits" into two "daughter" nuclei of Palladium (46 protons each) – this is not how it really happens, but it's a very simple model that actually gives fairly accurate results. The radius of the original U-235 nucleus is about 7.4 x 10-15 m. (a) If the Pd nuclei each have half the volume of the U nucleus, which is reasonable, and they are "touching" right after the split, how far apart are their centers? (b) Using conservation of energy, what will be the sum of the kinetic energies of the Pd nuclei when they are far apart from each other? (c) That's energy of one atom undergoing fission, so what, then, is the energy released by the fission of 1 kg of U-235? Express this in Joules and also in kilotons of TNT, where 1 kt = 4.2x1012 J. (The Hiroshima bomb yielded about 15 kt) (d) How many kwh (kilowatt-hours) of energy is this, (1 kwh = 3.6x10° J), and (if…
Growth of yeast cells In a controlled laboratory experiment, yeast cells are grown in an automated cell culture system that counts the number P of cells present at hourly intervals. The num- ber after t hours is shown in the accompanying figure. 250 200 150 100 50 0 1 2 3 4 5 6 7 a. Explain what is meant by the derivative P'(5). What are its units? b. Which is larger, P'(2) or P'(3)? Give a reason for your answer. c. The quadratic curve capturing the trend of the data points (see Section 1.4) is given by P(t) = 6.10r2 – 9.28t + 16.43. Find the instantaneous rate of growth when t = 5 hours.
Let ρAl represent the density of aluminum and ρFe that of iron. Find the radius of a solid aluminum sphere that balances a solid iron sphere of radius rFe on an equal-arm balance.